Rubber tire



ci. fr It@ i; fm *7** l i all in. .t

i ABRAHAM If. FREEDLANDEIEL AND WLLAM GEURGE GUDWIN, F DAYTON, OHM),

RUBBER TIRE.

minuti.

Specillcation of Letters latent.

Patented lllay 23; i922.

application ilerl March 5, 1921. Serial lio. trl-9,773.

To all whom t may concern: r Be it known that we, ABRAHAM L. Fianna .inname and WILLIAM G. GOODWIN., citizens olf the United States; residing at Dayton; in the county of `lldontgomery and State of Ohio, have invented certain new and useful improvements in Rubber Tires, oi' which the' following is a speciication, reference being had therein to the accompanying drawing. i y

This invention relates to improvements in rubber tires for vehiclesysuch as automobile-s.

rlhe object ot the invention is to accomplish two results;r one of them in particular', in the order here stated, namely7 to increase the resiliency and therefore toiinprove the riding qualities of the tire without ma terially lessening its load-carrying capacity, so that, for instance., a tire of this kind will yield readily under a compression force equal to` 600 pounds while yet perfectly capable of normally maintaining a load ot 800 pounds; and to reduce the quantity ot certain portions ot materials used in building the tire; while yet retaining these results, so as to lessen the cost by the amount of material thus saved.

These ends are accomplished and carried into practical eilect by omitting from what is known as the piers of the tire, (the stout walls on the interior or' the tread which act like spokes to sustain the treath) certain portions or the material of which the piers are composed. The shape and general body of the piers and their frequency or number in a given tire, enable them to sustain the load with a degree of resiliency consonant with their bulk and composition, yet by the omission of certain portions oit 4the piers we have 4tound that the pier as a whole will yield agreeably and comfortably under pressures materially less than their maximum load carrying capacity.

In the accompanying drawings:

Fig. l. is a vertical sectional view through a portion. of a tire with our improvements incorporated therein; i

lTig. 2 is a transverse sectional view say on the line -m of Fig. l, and looking in the direction of the arrow so as to show one side oit' one of the piers; the view illustrating the tire withoutload;

Fig. 3 is a similar sectional view showing the tire `under load and yielding under a pressure much less than its load carrying capacity. w

llei'erring to the drawings generally the numeral l designates the outer wall or cas ing of our tire having the usual or any approved tread sur'lace 2 and beads 3 for interA locking with the tire-retaining devices of the channel iron. it intervals we `torni within this casing piers 4t, the number oi piers to a given tire and the distance of the space between each two being controlled by the size or diameter oi the tire. The size or bulk olf these piers bears also a certain :ratio to the load-carrying capacity ot the tire; all oil these elements being known and understood by those skilled in this art.

W hen the tires are mounted on automobile wheels and are subjected to load-carrying effects they, including` these piers Il, oi' course7 generally compress, shortening radially and widening laterally. These piersE they extend to the inner periphery ot the tires; afford the material support tor the incumbent weight. This change of proportions and conguration takes place, oi course, only through a short section of that por-- tion ot the tires which for the moment is in contact with the ground. As the tires are proportioned and constructed to withstand or carry certain so called normal loads they will undergo these changes of dimensions but slightly, if at all, when the load is applied and no jars are being su'ered.

But when obstructions in the road surface are encountered which tend to make the tires yield and compress in response to sudden strains and forces our invention comes into play. With it the tires are more sensitive and yield under less force, so that their yieldability commences and takes place under conditions where without our invention they would not yield at all.

This result is due to the peculiarity of omitting portions of the material which compose the piers, yet without lessening the general dimensions of the piers and without departing 'from their outlines, which, as shown in Figs. 2 and 3, afford certain arch effects by which the piers give strength and staunchness to the tires to enable them to hold up their loads.

lWe have found that the most efficient and satisiiactory method of omission of material irom the piers is that shown in l, 2 and in which each pier is constructed with a series of aiternating grooves and ribs G. The ribs preserve the general dimensions in one direction of the piers AWhile the grooves cause an omission oit rubber which, though slight in each place, is mateial as to each pier and comprehensive as toa say7 three piers inclusive, which number, and more particularly the middle one, would be involved in an act of quick yieldability of the tire when subjected to a Lroad bump.

By this construction we have ascertaineifl under practical applications that onr tire yields quickly, softly and comfortably under conditions which without this improvement have required several lnindred pounds greater iforce to cause them to yield.

W hen our tire so yields by reason of this invention the grooves 5 become reduced in width and the ribs (3 move closer together, as noticed by a comparison oit' Fig. with Fig. 2, the former figure illustrating the tire under a given or sudden excessive strain or Yforce over normal. Eind the tire under this construction instantly responds and returns to normal position and shape as soon the occasion is passed.

rhus Without lessening` the load cznfrying capacity of a given tire in any appreciable or practical degree we have added to its by Leiters Patent, is

i'.. tire consiructed or u. casing; having l, Y .p b, l y a tre' portion and interior piers extendl nig to the inner periphery thereof, placed 2 in one :Lifter another and duly spaced apart portions ot the body oi the omitted :it nlzices not :i'lieciine Y, L A ano die tread portire constructed oi' :i casini: and

t piers e,:teinlini;l to the inner pc reoir and placed in :successen i-pliery i one :'r'i'ter another. portions ot the transverse l'aces oil the piersv beine' oiniiied.

. in tire constructed oil :i famine" und ending to the inner periphery there- )luced in succession one al'i'er :inrtions ot the ncrnntinp` in grooves and rihs.

the;T p

ners z 'i. ln :i tire constructed of n casing [1:1 rinp;

a tre: d portion :ind :i succession ol' piers ex tending 'to the inner periphery thereof' :nid placed within :ind united to r-'zi'd trend portion, both transverse surfaces ot each pier fashioned into alternate :grooves ond ribs.

ln testimony whereof, wo :iliix our signatures.

ABPH L. Vfti lGDlQNDilI. WlLLlQih'l GEORGE ((}i')D\'Vl N. 

